They definitely push the envelope but they have a point.

Warning: This is an explicit video.

Use Of ‘N-Word’ May End Porn Star’s Career

Interestingly enough a very recent article in EW directly attacks the FCC for going too far. Ignore the political undertone and focus on the key message which is that the FCC is not in touch with the reality of discourse in our lives: http://www.ew.com/ew/article/0,,20058153,00.html